MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
ZBrush - ZBrush is a digital sculpting and painting software solution.